ParamTag.java from Frame2 Web Application Framework at Krugle

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/*
 * ====================================================================
 *
 * Frame2 Open Source License
 *
 * Copyright (c) 2004-2007 Megatome Technologies.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by
 *        Megatome Technologies."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Frame2 Project", and "Frame2", 
 *    must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact iamthechad@sourceforge.net.
 *
 * 5. Products derived from this software may not be called "Frame2"
 *    nor may "Frame2" appear in their names without prior written
 *    permission of Megatome Technologies.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL MEGATOME TECHNOLOGIES OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 */
package org.megatome.frame2.taglib.template.el;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.Tag;

import org.megatome.frame2.taglib.template.TemplateConstants;
import org.megatome.frame2.tagsupport.BaseFrame2Tag;

public class ParamTag extends BaseFrame2Tag {

	private static final long serialVersionUID = -1585688023653903751L;

	/**
	 * 
	 */
	public ParamTag() {
		super();
	}

	@Override
	protected void setTagName() {
		this.tagName = TemplateConstants.PARAM_TAG;
	}

	/**
	 * @return
	 */
	public String getName() {
		return getAttr(TemplateConstants.NAME);
	}

	/**
	 * @return
	 */
	public String getValue() {
		return getAttr(TemplateConstants.VALUE);
	}

	/**
	 * @param string
	 */
	public void setName(String name) {
		setAttr(TemplateConstants.NAME, name);
	}

	/**
	 * @param string
	 */
	public void setValue(String value) {
		setAttr(TemplateConstants.VALUE, value);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.servlet.jsp.tagext.Tag#doStartTag()
	 */
	@Override
	public int doStartTag() throws JspException {
		Tag parentTag = getParent();
		if ((parentTag == null) || !(parentTag instanceof InsertTag)) {
			throw new JspException(
					"Param Tag must be contained within an Insert Tag"); //$NON-NLS-1$
		}

		String paramName = evaluateStringAttribute(TemplateConstants.NAME);

		if (paramName.equals("")) { //$NON-NLS-1$
			throw new JspException("Parameter name in param cannot be empty"); //$NON-NLS-1$
		}

		String paramValue = evaluateStringAttribute(TemplateConstants.VALUE);
		((InsertTag) parentTag).addParameter(paramName, paramValue);
		return Tag.SKIP_BODY;
	}
}
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